| /* |
| * pNFS functions to call and manage layout drivers. |
| * |
| * Copyright (c) 2002 [year of first publication] |
| * The Regents of the University of Michigan |
| * All Rights Reserved |
| * |
| * Dean Hildebrand <dhildebz@umich.edu> |
| * |
| * Permission is granted to use, copy, create derivative works, and |
| * redistribute this software and such derivative works for any purpose, |
| * so long as the name of the University of Michigan is not used in |
| * any advertising or publicity pertaining to the use or distribution |
| * of this software without specific, written prior authorization. If |
| * the above copyright notice or any other identification of the |
| * University of Michigan is included in any copy of any portion of |
| * this software, then the disclaimer below must also be included. |
| * |
| * This software is provided as is, without representation or warranty |
| * of any kind either express or implied, including without limitation |
| * the implied warranties of merchantability, fitness for a particular |
| * purpose, or noninfringement. The Regents of the University of |
| * Michigan shall not be liable for any damages, including special, |
| * indirect, incidental, or consequential damages, with respect to any |
| * claim arising out of or in connection with the use of the software, |
| * even if it has been or is hereafter advised of the possibility of |
| * such damages. |
| */ |
| |
| #include <linux/nfs_fs.h> |
| #include "internal.h" |
| #include "pnfs.h" |
| #include "iostat.h" |
| |
| #define NFSDBG_FACILITY NFSDBG_PNFS |
| |
| /* Locking: |
| * |
| * pnfs_spinlock: |
| * protects pnfs_modules_tbl. |
| */ |
| static DEFINE_SPINLOCK(pnfs_spinlock); |
| |
| /* |
| * pnfs_modules_tbl holds all pnfs modules |
| */ |
| static LIST_HEAD(pnfs_modules_tbl); |
| |
| /* Return the registered pnfs layout driver module matching given id */ |
| static struct pnfs_layoutdriver_type * |
| find_pnfs_driver_locked(u32 id) |
| { |
| struct pnfs_layoutdriver_type *local; |
| |
| list_for_each_entry(local, &pnfs_modules_tbl, pnfs_tblid) |
| if (local->id == id) |
| goto out; |
| local = NULL; |
| out: |
| dprintk("%s: Searching for id %u, found %p\n", __func__, id, local); |
| return local; |
| } |
| |
| static struct pnfs_layoutdriver_type * |
| find_pnfs_driver(u32 id) |
| { |
| struct pnfs_layoutdriver_type *local; |
| |
| spin_lock(&pnfs_spinlock); |
| local = find_pnfs_driver_locked(id); |
| spin_unlock(&pnfs_spinlock); |
| return local; |
| } |
| |
| void |
| unset_pnfs_layoutdriver(struct nfs_server *nfss) |
| { |
| if (nfss->pnfs_curr_ld) |
| module_put(nfss->pnfs_curr_ld->owner); |
| nfss->pnfs_curr_ld = NULL; |
| } |
| |
| /* |
| * Try to set the server's pnfs module to the pnfs layout type specified by id. |
| * Currently only one pNFS layout driver per filesystem is supported. |
| * |
| * @id layout type. Zero (illegal layout type) indicates pNFS not in use. |
| */ |
| void |
| set_pnfs_layoutdriver(struct nfs_server *server, u32 id) |
| { |
| struct pnfs_layoutdriver_type *ld_type = NULL; |
| |
| if (id == 0) |
| goto out_no_driver; |
| if (!(server->nfs_client->cl_exchange_flags & |
| (EXCHGID4_FLAG_USE_NON_PNFS | EXCHGID4_FLAG_USE_PNFS_MDS))) { |
| printk(KERN_ERR "%s: id %u cl_exchange_flags 0x%x\n", __func__, |
| id, server->nfs_client->cl_exchange_flags); |
| goto out_no_driver; |
| } |
| ld_type = find_pnfs_driver(id); |
| if (!ld_type) { |
| request_module("%s-%u", LAYOUT_NFSV4_1_MODULE_PREFIX, id); |
| ld_type = find_pnfs_driver(id); |
| if (!ld_type) { |
| dprintk("%s: No pNFS module found for %u.\n", |
| __func__, id); |
| goto out_no_driver; |
| } |
| } |
| if (!try_module_get(ld_type->owner)) { |
| dprintk("%s: Could not grab reference on module\n", __func__); |
| goto out_no_driver; |
| } |
| server->pnfs_curr_ld = ld_type; |
| |
| dprintk("%s: pNFS module for %u set\n", __func__, id); |
| return; |
| |
| out_no_driver: |
| dprintk("%s: Using NFSv4 I/O\n", __func__); |
| server->pnfs_curr_ld = NULL; |
| } |
| |
| int |
| pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *ld_type) |
| { |
| int status = -EINVAL; |
| struct pnfs_layoutdriver_type *tmp; |
| |
| if (ld_type->id == 0) { |
| printk(KERN_ERR "%s id 0 is reserved\n", __func__); |
| return status; |
| } |
| if (!ld_type->alloc_lseg || !ld_type->free_lseg) { |
| printk(KERN_ERR "%s Layout driver must provide " |
| "alloc_lseg and free_lseg.\n", __func__); |
| return status; |
| } |
| |
| spin_lock(&pnfs_spinlock); |
| tmp = find_pnfs_driver_locked(ld_type->id); |
| if (!tmp) { |
| list_add(&ld_type->pnfs_tblid, &pnfs_modules_tbl); |
| status = 0; |
| dprintk("%s Registering id:%u name:%s\n", __func__, ld_type->id, |
| ld_type->name); |
| } else { |
| printk(KERN_ERR "%s Module with id %d already loaded!\n", |
| __func__, ld_type->id); |
| } |
| spin_unlock(&pnfs_spinlock); |
| |
| return status; |
| } |
| EXPORT_SYMBOL_GPL(pnfs_register_layoutdriver); |
| |
| void |
| pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *ld_type) |
| { |
| dprintk("%s Deregistering id:%u\n", __func__, ld_type->id); |
| spin_lock(&pnfs_spinlock); |
| list_del(&ld_type->pnfs_tblid); |
| spin_unlock(&pnfs_spinlock); |
| } |
| EXPORT_SYMBOL_GPL(pnfs_unregister_layoutdriver); |
| |
| /* |
| * pNFS client layout cache |
| */ |
| |
| /* Need to hold i_lock if caller does not already hold reference */ |
| void |
| get_layout_hdr(struct pnfs_layout_hdr *lo) |
| { |
| atomic_inc(&lo->plh_refcount); |
| } |
| |
| static struct pnfs_layout_hdr * |
| pnfs_alloc_layout_hdr(struct inode *ino, gfp_t gfp_flags) |
| { |
| struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld; |
| return ld->alloc_layout_hdr ? ld->alloc_layout_hdr(ino, gfp_flags) : |
| kzalloc(sizeof(struct pnfs_layout_hdr), gfp_flags); |
| } |
| |
| static void |
| pnfs_free_layout_hdr(struct pnfs_layout_hdr *lo) |
| { |
| struct pnfs_layoutdriver_type *ld = NFS_SERVER(lo->plh_inode)->pnfs_curr_ld; |
| return ld->alloc_layout_hdr ? ld->free_layout_hdr(lo) : kfree(lo); |
| } |
| |
| static void |
| destroy_layout_hdr(struct pnfs_layout_hdr *lo) |
| { |
| dprintk("%s: freeing layout cache %p\n", __func__, lo); |
| BUG_ON(!list_empty(&lo->plh_layouts)); |
| NFS_I(lo->plh_inode)->layout = NULL; |
| pnfs_free_layout_hdr(lo); |
| } |
| |
| static void |
| put_layout_hdr_locked(struct pnfs_layout_hdr *lo) |
| { |
| if (atomic_dec_and_test(&lo->plh_refcount)) |
| destroy_layout_hdr(lo); |
| } |
| |
| void |
| put_layout_hdr(struct pnfs_layout_hdr *lo) |
| { |
| struct inode *inode = lo->plh_inode; |
| |
| if (atomic_dec_and_lock(&lo->plh_refcount, &inode->i_lock)) { |
| destroy_layout_hdr(lo); |
| spin_unlock(&inode->i_lock); |
| } |
| } |
| |
| static void |
| init_lseg(struct pnfs_layout_hdr *lo, struct pnfs_layout_segment *lseg) |
| { |
| INIT_LIST_HEAD(&lseg->pls_list); |
| atomic_set(&lseg->pls_refcount, 1); |
| smp_mb(); |
| set_bit(NFS_LSEG_VALID, &lseg->pls_flags); |
| lseg->pls_layout = lo; |
| } |
| |
| static void free_lseg(struct pnfs_layout_segment *lseg) |
| { |
| struct inode *ino = lseg->pls_layout->plh_inode; |
| |
| NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg); |
| /* Matched by get_layout_hdr in pnfs_insert_layout */ |
| put_layout_hdr(NFS_I(ino)->layout); |
| } |
| |
| static void |
| put_lseg_common(struct pnfs_layout_segment *lseg) |
| { |
| struct inode *inode = lseg->pls_layout->plh_inode; |
| |
| BUG_ON(test_bit(NFS_LSEG_VALID, &lseg->pls_flags)); |
| list_del_init(&lseg->pls_list); |
| if (list_empty(&lseg->pls_layout->plh_segs)) { |
| set_bit(NFS_LAYOUT_DESTROYED, &lseg->pls_layout->plh_flags); |
| /* Matched by initial refcount set in alloc_init_layout_hdr */ |
| put_layout_hdr_locked(lseg->pls_layout); |
| } |
| rpc_wake_up(&NFS_SERVER(inode)->roc_rpcwaitq); |
| } |
| |
| void |
| put_lseg(struct pnfs_layout_segment *lseg) |
| { |
| struct inode *inode; |
| |
| if (!lseg) |
| return; |
| |
| dprintk("%s: lseg %p ref %d valid %d\n", __func__, lseg, |
| atomic_read(&lseg->pls_refcount), |
| test_bit(NFS_LSEG_VALID, &lseg->pls_flags)); |
| inode = lseg->pls_layout->plh_inode; |
| if (atomic_dec_and_lock(&lseg->pls_refcount, &inode->i_lock)) { |
| LIST_HEAD(free_me); |
| |
| put_lseg_common(lseg); |
| list_add(&lseg->pls_list, &free_me); |
| spin_unlock(&inode->i_lock); |
| pnfs_free_lseg_list(&free_me); |
| } |
| } |
| EXPORT_SYMBOL_GPL(put_lseg); |
| |
| static inline u64 |
| end_offset(u64 start, u64 len) |
| { |
| u64 end; |
| |
| end = start + len; |
| return end >= start ? end : NFS4_MAX_UINT64; |
| } |
| |
| /* last octet in a range */ |
| static inline u64 |
| last_byte_offset(u64 start, u64 len) |
| { |
| u64 end; |
| |
| BUG_ON(!len); |
| end = start + len; |
| return end > start ? end - 1 : NFS4_MAX_UINT64; |
| } |
| |
| /* |
| * is l2 fully contained in l1? |
| * start1 end1 |
| * [----------------------------------) |
| * start2 end2 |
| * [----------------) |
| */ |
| static inline int |
| lo_seg_contained(struct pnfs_layout_range *l1, |
| struct pnfs_layout_range *l2) |
| { |
| u64 start1 = l1->offset; |
| u64 end1 = end_offset(start1, l1->length); |
| u64 start2 = l2->offset; |
| u64 end2 = end_offset(start2, l2->length); |
| |
| return (start1 <= start2) && (end1 >= end2); |
| } |
| |
| /* |
| * is l1 and l2 intersecting? |
| * start1 end1 |
| * [----------------------------------) |
| * start2 end2 |
| * [----------------) |
| */ |
| static inline int |
| lo_seg_intersecting(struct pnfs_layout_range *l1, |
| struct pnfs_layout_range *l2) |
| { |
| u64 start1 = l1->offset; |
| u64 end1 = end_offset(start1, l1->length); |
| u64 start2 = l2->offset; |
| u64 end2 = end_offset(start2, l2->length); |
| |
| return (end1 == NFS4_MAX_UINT64 || end1 > start2) && |
| (end2 == NFS4_MAX_UINT64 || end2 > start1); |
| } |
| |
| static bool |
| should_free_lseg(struct pnfs_layout_range *lseg_range, |
| struct pnfs_layout_range *recall_range) |
| { |
| return (recall_range->iomode == IOMODE_ANY || |
| lseg_range->iomode == recall_range->iomode) && |
| lo_seg_intersecting(lseg_range, recall_range); |
| } |
| |
| /* Returns 1 if lseg is removed from list, 0 otherwise */ |
| static int mark_lseg_invalid(struct pnfs_layout_segment *lseg, |
| struct list_head *tmp_list) |
| { |
| int rv = 0; |
| |
| if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags)) { |
| /* Remove the reference keeping the lseg in the |
| * list. It will now be removed when all |
| * outstanding io is finished. |
| */ |
| dprintk("%s: lseg %p ref %d\n", __func__, lseg, |
| atomic_read(&lseg->pls_refcount)); |
| if (atomic_dec_and_test(&lseg->pls_refcount)) { |
| put_lseg_common(lseg); |
| list_add(&lseg->pls_list, tmp_list); |
| rv = 1; |
| } |
| } |
| return rv; |
| } |
| |
| /* Returns count of number of matching invalid lsegs remaining in list |
| * after call. |
| */ |
| int |
| mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo, |
| struct list_head *tmp_list, |
| struct pnfs_layout_range *recall_range) |
| { |
| struct pnfs_layout_segment *lseg, *next; |
| int invalid = 0, removed = 0; |
| |
| dprintk("%s:Begin lo %p\n", __func__, lo); |
| |
| if (list_empty(&lo->plh_segs)) { |
| if (!test_and_set_bit(NFS_LAYOUT_DESTROYED, &lo->plh_flags)) |
| put_layout_hdr_locked(lo); |
| return 0; |
| } |
| list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list) |
| if (!recall_range || |
| should_free_lseg(&lseg->pls_range, recall_range)) { |
| dprintk("%s: freeing lseg %p iomode %d " |
| "offset %llu length %llu\n", __func__, |
| lseg, lseg->pls_range.iomode, lseg->pls_range.offset, |
| lseg->pls_range.length); |
| invalid++; |
| removed += mark_lseg_invalid(lseg, tmp_list); |
| } |
| dprintk("%s:Return %i\n", __func__, invalid - removed); |
| return invalid - removed; |
| } |
| |
| /* note free_me must contain lsegs from a single layout_hdr */ |
| void |
| pnfs_free_lseg_list(struct list_head *free_me) |
| { |
| struct pnfs_layout_segment *lseg, *tmp; |
| struct pnfs_layout_hdr *lo; |
| |
| if (list_empty(free_me)) |
| return; |
| |
| lo = list_first_entry(free_me, struct pnfs_layout_segment, |
| pls_list)->pls_layout; |
| |
| if (test_bit(NFS_LAYOUT_DESTROYED, &lo->plh_flags)) { |
| struct nfs_client *clp; |
| |
| clp = NFS_SERVER(lo->plh_inode)->nfs_client; |
| spin_lock(&clp->cl_lock); |
| list_del_init(&lo->plh_layouts); |
| spin_unlock(&clp->cl_lock); |
| } |
| list_for_each_entry_safe(lseg, tmp, free_me, pls_list) { |
| list_del(&lseg->pls_list); |
| free_lseg(lseg); |
| } |
| } |
| |
| void |
| pnfs_destroy_layout(struct nfs_inode *nfsi) |
| { |
| struct pnfs_layout_hdr *lo; |
| LIST_HEAD(tmp_list); |
| |
| spin_lock(&nfsi->vfs_inode.i_lock); |
| lo = nfsi->layout; |
| if (lo) { |
| lo->plh_block_lgets++; /* permanently block new LAYOUTGETs */ |
| mark_matching_lsegs_invalid(lo, &tmp_list, NULL); |
| } |
| spin_unlock(&nfsi->vfs_inode.i_lock); |
| pnfs_free_lseg_list(&tmp_list); |
| } |
| |
| /* |
| * Called by the state manger to remove all layouts established under an |
| * expired lease. |
| */ |
| void |
| pnfs_destroy_all_layouts(struct nfs_client *clp) |
| { |
| struct pnfs_layout_hdr *lo; |
| LIST_HEAD(tmp_list); |
| |
| spin_lock(&clp->cl_lock); |
| list_splice_init(&clp->cl_layouts, &tmp_list); |
| spin_unlock(&clp->cl_lock); |
| |
| while (!list_empty(&tmp_list)) { |
| lo = list_entry(tmp_list.next, struct pnfs_layout_hdr, |
| plh_layouts); |
| dprintk("%s freeing layout for inode %lu\n", __func__, |
| lo->plh_inode->i_ino); |
| list_del_init(&lo->plh_layouts); |
| pnfs_destroy_layout(NFS_I(lo->plh_inode)); |
| } |
| } |
| |
| /* update lo->plh_stateid with new if is more recent */ |
| void |
| pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, const nfs4_stateid *new, |
| bool update_barrier) |
| { |
| u32 oldseq, newseq; |
| |
| oldseq = be32_to_cpu(lo->plh_stateid.stateid.seqid); |
| newseq = be32_to_cpu(new->stateid.seqid); |
| if ((int)(newseq - oldseq) > 0) { |
| memcpy(&lo->plh_stateid, &new->stateid, sizeof(new->stateid)); |
| if (update_barrier) { |
| u32 new_barrier = be32_to_cpu(new->stateid.seqid); |
| |
| if ((int)(new_barrier - lo->plh_barrier)) |
| lo->plh_barrier = new_barrier; |
| } else { |
| /* Because of wraparound, we want to keep the barrier |
| * "close" to the current seqids. It needs to be |
| * within 2**31 to count as "behind", so if it |
| * gets too near that limit, give us a litle leeway |
| * and bring it to within 2**30. |
| * NOTE - and yes, this is all unsigned arithmetic. |
| */ |
| if (unlikely((newseq - lo->plh_barrier) > (3 << 29))) |
| lo->plh_barrier = newseq - (1 << 30); |
| } |
| } |
| } |
| |
| /* lget is set to 1 if called from inside send_layoutget call chain */ |
| static bool |
| pnfs_layoutgets_blocked(struct pnfs_layout_hdr *lo, nfs4_stateid *stateid, |
| int lget) |
| { |
| if ((stateid) && |
| (int)(lo->plh_barrier - be32_to_cpu(stateid->stateid.seqid)) >= 0) |
| return true; |
| return lo->plh_block_lgets || |
| test_bit(NFS_LAYOUT_DESTROYED, &lo->plh_flags) || |
| test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags) || |
| (list_empty(&lo->plh_segs) && |
| (atomic_read(&lo->plh_outstanding) > lget)); |
| } |
| |
| int |
| pnfs_choose_layoutget_stateid(nfs4_stateid *dst, struct pnfs_layout_hdr *lo, |
| struct nfs4_state *open_state) |
| { |
| int status = 0; |
| |
| dprintk("--> %s\n", __func__); |
| spin_lock(&lo->plh_inode->i_lock); |
| if (pnfs_layoutgets_blocked(lo, NULL, 1)) { |
| status = -EAGAIN; |
| } else if (list_empty(&lo->plh_segs)) { |
| int seq; |
| |
| do { |
| seq = read_seqbegin(&open_state->seqlock); |
| memcpy(dst->data, open_state->stateid.data, |
| sizeof(open_state->stateid.data)); |
| } while (read_seqretry(&open_state->seqlock, seq)); |
| } else |
| memcpy(dst->data, lo->plh_stateid.data, sizeof(lo->plh_stateid.data)); |
| spin_unlock(&lo->plh_inode->i_lock); |
| dprintk("<-- %s\n", __func__); |
| return status; |
| } |
| |
| /* |
| * Get layout from server. |
| * for now, assume that whole file layouts are requested. |
| * arg->offset: 0 |
| * arg->length: all ones |
| */ |
| static struct pnfs_layout_segment * |
| send_layoutget(struct pnfs_layout_hdr *lo, |
| struct nfs_open_context *ctx, |
| struct pnfs_layout_range *range, |
| gfp_t gfp_flags) |
| { |
| struct inode *ino = lo->plh_inode; |
| struct nfs_server *server = NFS_SERVER(ino); |
| struct nfs4_layoutget *lgp; |
| struct pnfs_layout_segment *lseg = NULL; |
| struct page **pages = NULL; |
| int i; |
| u32 max_resp_sz, max_pages; |
| |
| dprintk("--> %s\n", __func__); |
| |
| BUG_ON(ctx == NULL); |
| lgp = kzalloc(sizeof(*lgp), gfp_flags); |
| if (lgp == NULL) |
| return NULL; |
| |
| /* allocate pages for xdr post processing */ |
| max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz; |
| max_pages = max_resp_sz >> PAGE_SHIFT; |
| |
| pages = kzalloc(max_pages * sizeof(struct page *), gfp_flags); |
| if (!pages) |
| goto out_err_free; |
| |
| for (i = 0; i < max_pages; i++) { |
| pages[i] = alloc_page(gfp_flags); |
| if (!pages[i]) |
| goto out_err_free; |
| } |
| |
| lgp->args.minlength = PAGE_CACHE_SIZE; |
| if (lgp->args.minlength > range->length) |
| lgp->args.minlength = range->length; |
| lgp->args.maxcount = PNFS_LAYOUT_MAXSIZE; |
| lgp->args.range = *range; |
| lgp->args.type = server->pnfs_curr_ld->id; |
| lgp->args.inode = ino; |
| lgp->args.ctx = get_nfs_open_context(ctx); |
| lgp->args.layout.pages = pages; |
| lgp->args.layout.pglen = max_pages * PAGE_SIZE; |
| lgp->lsegpp = &lseg; |
| lgp->gfp_flags = gfp_flags; |
| |
| /* Synchronously retrieve layout information from server and |
| * store in lseg. |
| */ |
| nfs4_proc_layoutget(lgp); |
| if (!lseg) { |
| /* remember that LAYOUTGET failed and suspend trying */ |
| set_bit(lo_fail_bit(range->iomode), &lo->plh_flags); |
| } |
| |
| /* free xdr pages */ |
| for (i = 0; i < max_pages; i++) |
| __free_page(pages[i]); |
| kfree(pages); |
| |
| return lseg; |
| |
| out_err_free: |
| /* free any allocated xdr pages, lgp as it's not used */ |
| if (pages) { |
| for (i = 0; i < max_pages; i++) { |
| if (!pages[i]) |
| break; |
| __free_page(pages[i]); |
| } |
| kfree(pages); |
| } |
| kfree(lgp); |
| return NULL; |
| } |
| |
| bool pnfs_roc(struct inode *ino) |
| { |
| struct pnfs_layout_hdr *lo; |
| struct pnfs_layout_segment *lseg, *tmp; |
| LIST_HEAD(tmp_list); |
| bool found = false; |
| |
| spin_lock(&ino->i_lock); |
| lo = NFS_I(ino)->layout; |
| if (!lo || !test_and_clear_bit(NFS_LAYOUT_ROC, &lo->plh_flags) || |
| test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) |
| goto out_nolayout; |
| list_for_each_entry_safe(lseg, tmp, &lo->plh_segs, pls_list) |
| if (test_bit(NFS_LSEG_ROC, &lseg->pls_flags)) { |
| mark_lseg_invalid(lseg, &tmp_list); |
| found = true; |
| } |
| if (!found) |
| goto out_nolayout; |
| lo->plh_block_lgets++; |
| get_layout_hdr(lo); /* matched in pnfs_roc_release */ |
| spin_unlock(&ino->i_lock); |
| pnfs_free_lseg_list(&tmp_list); |
| return true; |
| |
| out_nolayout: |
| spin_unlock(&ino->i_lock); |
| return false; |
| } |
| |
| void pnfs_roc_release(struct inode *ino) |
| { |
| struct pnfs_layout_hdr *lo; |
| |
| spin_lock(&ino->i_lock); |
| lo = NFS_I(ino)->layout; |
| lo->plh_block_lgets--; |
| put_layout_hdr_locked(lo); |
| spin_unlock(&ino->i_lock); |
| } |
| |
| void pnfs_roc_set_barrier(struct inode *ino, u32 barrier) |
| { |
| struct pnfs_layout_hdr *lo; |
| |
| spin_lock(&ino->i_lock); |
| lo = NFS_I(ino)->layout; |
| if ((int)(barrier - lo->plh_barrier) > 0) |
| lo->plh_barrier = barrier; |
| spin_unlock(&ino->i_lock); |
| } |
| |
| bool pnfs_roc_drain(struct inode *ino, u32 *barrier) |
| { |
| struct nfs_inode *nfsi = NFS_I(ino); |
| struct pnfs_layout_segment *lseg; |
| bool found = false; |
| |
| spin_lock(&ino->i_lock); |
| list_for_each_entry(lseg, &nfsi->layout->plh_segs, pls_list) |
| if (test_bit(NFS_LSEG_ROC, &lseg->pls_flags)) { |
| found = true; |
| break; |
| } |
| if (!found) { |
| struct pnfs_layout_hdr *lo = nfsi->layout; |
| u32 current_seqid = be32_to_cpu(lo->plh_stateid.stateid.seqid); |
| |
| /* Since close does not return a layout stateid for use as |
| * a barrier, we choose the worst-case barrier. |
| */ |
| *barrier = current_seqid + atomic_read(&lo->plh_outstanding); |
| } |
| spin_unlock(&ino->i_lock); |
| return found; |
| } |
| |
| /* |
| * Compare two layout segments for sorting into layout cache. |
| * We want to preferentially return RW over RO layouts, so ensure those |
| * are seen first. |
| */ |
| static s64 |
| cmp_layout(struct pnfs_layout_range *l1, |
| struct pnfs_layout_range *l2) |
| { |
| s64 d; |
| |
| /* high offset > low offset */ |
| d = l1->offset - l2->offset; |
| if (d) |
| return d; |
| |
| /* short length > long length */ |
| d = l2->length - l1->length; |
| if (d) |
| return d; |
| |
| /* read > read/write */ |
| return (int)(l1->iomode == IOMODE_READ) - (int)(l2->iomode == IOMODE_READ); |
| } |
| |
| static void |
| pnfs_insert_layout(struct pnfs_layout_hdr *lo, |
| struct pnfs_layout_segment *lseg) |
| { |
| struct pnfs_layout_segment *lp; |
| |
| dprintk("%s:Begin\n", __func__); |
| |
| assert_spin_locked(&lo->plh_inode->i_lock); |
| list_for_each_entry(lp, &lo->plh_segs, pls_list) { |
| if (cmp_layout(&lseg->pls_range, &lp->pls_range) > 0) |
| continue; |
| list_add_tail(&lseg->pls_list, &lp->pls_list); |
| dprintk("%s: inserted lseg %p " |
| "iomode %d offset %llu length %llu before " |
| "lp %p iomode %d offset %llu length %llu\n", |
| __func__, lseg, lseg->pls_range.iomode, |
| lseg->pls_range.offset, lseg->pls_range.length, |
| lp, lp->pls_range.iomode, lp->pls_range.offset, |
| lp->pls_range.length); |
| goto out; |
| } |
| list_add_tail(&lseg->pls_list, &lo->plh_segs); |
| dprintk("%s: inserted lseg %p " |
| "iomode %d offset %llu length %llu at tail\n", |
| __func__, lseg, lseg->pls_range.iomode, |
| lseg->pls_range.offset, lseg->pls_range.length); |
| out: |
| get_layout_hdr(lo); |
| |
| dprintk("%s:Return\n", __func__); |
| } |
| |
| static struct pnfs_layout_hdr * |
| alloc_init_layout_hdr(struct inode *ino, gfp_t gfp_flags) |
| { |
| struct pnfs_layout_hdr *lo; |
| |
| lo = pnfs_alloc_layout_hdr(ino, gfp_flags); |
| if (!lo) |
| return NULL; |
| atomic_set(&lo->plh_refcount, 1); |
| INIT_LIST_HEAD(&lo->plh_layouts); |
| INIT_LIST_HEAD(&lo->plh_segs); |
| INIT_LIST_HEAD(&lo->plh_bulk_recall); |
| lo->plh_inode = ino; |
| return lo; |
| } |
| |
| static struct pnfs_layout_hdr * |
| pnfs_find_alloc_layout(struct inode *ino, gfp_t gfp_flags) |
| { |
| struct nfs_inode *nfsi = NFS_I(ino); |
| struct pnfs_layout_hdr *new = NULL; |
| |
| dprintk("%s Begin ino=%p layout=%p\n", __func__, ino, nfsi->layout); |
| |
| assert_spin_locked(&ino->i_lock); |
| if (nfsi->layout) { |
| if (test_bit(NFS_LAYOUT_DESTROYED, &nfsi->layout->plh_flags)) |
| return NULL; |
| else |
| return nfsi->layout; |
| } |
| spin_unlock(&ino->i_lock); |
| new = alloc_init_layout_hdr(ino, gfp_flags); |
| spin_lock(&ino->i_lock); |
| |
| if (likely(nfsi->layout == NULL)) /* Won the race? */ |
| nfsi->layout = new; |
| else |
| pnfs_free_layout_hdr(new); |
| return nfsi->layout; |
| } |
| |
| /* |
| * iomode matching rules: |
| * iomode lseg match |
| * ----- ----- ----- |
| * ANY READ true |
| * ANY RW true |
| * RW READ false |
| * RW RW true |
| * READ READ true |
| * READ RW true |
| */ |
| static int |
| is_matching_lseg(struct pnfs_layout_range *ls_range, |
| struct pnfs_layout_range *range) |
| { |
| struct pnfs_layout_range range1; |
| |
| if ((range->iomode == IOMODE_RW && |
| ls_range->iomode != IOMODE_RW) || |
| !lo_seg_intersecting(ls_range, range)) |
| return 0; |
| |
| /* range1 covers only the first byte in the range */ |
| range1 = *range; |
| range1.length = 1; |
| return lo_seg_contained(ls_range, &range1); |
| } |
| |
| /* |
| * lookup range in layout |
| */ |
| static struct pnfs_layout_segment * |
| pnfs_find_lseg(struct pnfs_layout_hdr *lo, |
| struct pnfs_layout_range *range) |
| { |
| struct pnfs_layout_segment *lseg, *ret = NULL; |
| |
| dprintk("%s:Begin\n", __func__); |
| |
| assert_spin_locked(&lo->plh_inode->i_lock); |
| list_for_each_entry(lseg, &lo->plh_segs, pls_list) { |
| if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags) && |
| is_matching_lseg(&lseg->pls_range, range)) { |
| ret = get_lseg(lseg); |
| break; |
| } |
| if (cmp_layout(range, &lseg->pls_range) > 0) |
| break; |
| } |
| |
| dprintk("%s:Return lseg %p ref %d\n", |
| __func__, ret, ret ? atomic_read(&ret->pls_refcount) : 0); |
| return ret; |
| } |
| |
| /* |
| * Layout segment is retreived from the server if not cached. |
| * The appropriate layout segment is referenced and returned to the caller. |
| */ |
| struct pnfs_layout_segment * |
| pnfs_update_layout(struct inode *ino, |
| struct nfs_open_context *ctx, |
| loff_t pos, |
| u64 count, |
| enum pnfs_iomode iomode, |
| gfp_t gfp_flags) |
| { |
| struct pnfs_layout_range arg = { |
| .iomode = iomode, |
| .offset = pos, |
| .length = count, |
| }; |
| unsigned pg_offset; |
| struct nfs_inode *nfsi = NFS_I(ino); |
| struct nfs_client *clp = NFS_SERVER(ino)->nfs_client; |
| struct pnfs_layout_hdr *lo; |
| struct pnfs_layout_segment *lseg = NULL; |
| bool first = false; |
| |
| if (!pnfs_enabled_sb(NFS_SERVER(ino))) |
| return NULL; |
| spin_lock(&ino->i_lock); |
| lo = pnfs_find_alloc_layout(ino, gfp_flags); |
| if (lo == NULL) { |
| dprintk("%s ERROR: can't get pnfs_layout_hdr\n", __func__); |
| goto out_unlock; |
| } |
| |
| /* Do we even need to bother with this? */ |
| if (test_bit(NFS4CLNT_LAYOUTRECALL, &clp->cl_state) || |
| test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) { |
| dprintk("%s matches recall, use MDS\n", __func__); |
| goto out_unlock; |
| } |
| |
| /* if LAYOUTGET already failed once we don't try again */ |
| if (test_bit(lo_fail_bit(iomode), &nfsi->layout->plh_flags)) |
| goto out_unlock; |
| |
| /* Check to see if the layout for the given range already exists */ |
| lseg = pnfs_find_lseg(lo, &arg); |
| if (lseg) |
| goto out_unlock; |
| |
| if (pnfs_layoutgets_blocked(lo, NULL, 0)) |
| goto out_unlock; |
| atomic_inc(&lo->plh_outstanding); |
| |
| get_layout_hdr(lo); |
| if (list_empty(&lo->plh_segs)) |
| first = true; |
| spin_unlock(&ino->i_lock); |
| if (first) { |
| /* The lo must be on the clp list if there is any |
| * chance of a CB_LAYOUTRECALL(FILE) coming in. |
| */ |
| spin_lock(&clp->cl_lock); |
| BUG_ON(!list_empty(&lo->plh_layouts)); |
| list_add_tail(&lo->plh_layouts, &clp->cl_layouts); |
| spin_unlock(&clp->cl_lock); |
| } |
| |
| pg_offset = arg.offset & ~PAGE_CACHE_MASK; |
| if (pg_offset) { |
| arg.offset -= pg_offset; |
| arg.length += pg_offset; |
| } |
| arg.length = PAGE_CACHE_ALIGN(arg.length); |
| |
| lseg = send_layoutget(lo, ctx, &arg, gfp_flags); |
| if (!lseg && first) { |
| spin_lock(&clp->cl_lock); |
| list_del_init(&lo->plh_layouts); |
| spin_unlock(&clp->cl_lock); |
| } |
| atomic_dec(&lo->plh_outstanding); |
| put_layout_hdr(lo); |
| out: |
| dprintk("%s end, state 0x%lx lseg %p\n", __func__, |
| nfsi->layout ? nfsi->layout->plh_flags : -1, lseg); |
| return lseg; |
| out_unlock: |
| spin_unlock(&ino->i_lock); |
| goto out; |
| } |
| |
| int |
| pnfs_layout_process(struct nfs4_layoutget *lgp) |
| { |
| struct pnfs_layout_hdr *lo = NFS_I(lgp->args.inode)->layout; |
| struct nfs4_layoutget_res *res = &lgp->res; |
| struct pnfs_layout_segment *lseg; |
| struct inode *ino = lo->plh_inode; |
| struct nfs_client *clp = NFS_SERVER(ino)->nfs_client; |
| int status = 0; |
| |
| /* Inject layout blob into I/O device driver */ |
| lseg = NFS_SERVER(ino)->pnfs_curr_ld->alloc_lseg(lo, res, lgp->gfp_flags); |
| if (!lseg || IS_ERR(lseg)) { |
| if (!lseg) |
| status = -ENOMEM; |
| else |
| status = PTR_ERR(lseg); |
| dprintk("%s: Could not allocate layout: error %d\n", |
| __func__, status); |
| goto out; |
| } |
| |
| spin_lock(&ino->i_lock); |
| if (test_bit(NFS4CLNT_LAYOUTRECALL, &clp->cl_state) || |
| test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) { |
| dprintk("%s forget reply due to recall\n", __func__); |
| goto out_forget_reply; |
| } |
| |
| if (pnfs_layoutgets_blocked(lo, &res->stateid, 1)) { |
| dprintk("%s forget reply due to state\n", __func__); |
| goto out_forget_reply; |
| } |
| init_lseg(lo, lseg); |
| lseg->pls_range = res->range; |
| *lgp->lsegpp = get_lseg(lseg); |
| pnfs_insert_layout(lo, lseg); |
| |
| if (res->return_on_close) { |
| set_bit(NFS_LSEG_ROC, &lseg->pls_flags); |
| set_bit(NFS_LAYOUT_ROC, &lo->plh_flags); |
| } |
| |
| /* Done processing layoutget. Set the layout stateid */ |
| pnfs_set_layout_stateid(lo, &res->stateid, false); |
| spin_unlock(&ino->i_lock); |
| out: |
| return status; |
| |
| out_forget_reply: |
| spin_unlock(&ino->i_lock); |
| lseg->pls_layout = lo; |
| NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg); |
| goto out; |
| } |
| |
| static int pnfs_read_pg_test(struct nfs_pageio_descriptor *pgio, |
| struct nfs_page *prev, |
| struct nfs_page *req) |
| { |
| if (pgio->pg_count == prev->wb_bytes) { |
| /* This is first coelesce call for a series of nfs_pages */ |
| pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, |
| prev->wb_context, |
| req_offset(req), |
| pgio->pg_count, |
| IOMODE_READ, |
| GFP_KERNEL); |
| } else if (pgio->pg_lseg && |
| req_offset(req) > end_offset(pgio->pg_lseg->pls_range.offset, |
| pgio->pg_lseg->pls_range.length)) |
| return 0; |
| return NFS_SERVER(pgio->pg_inode)->pnfs_curr_ld->pg_test(pgio, prev, req); |
| } |
| |
| void |
| pnfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, struct inode *inode) |
| { |
| struct pnfs_layoutdriver_type *ld; |
| |
| ld = NFS_SERVER(inode)->pnfs_curr_ld; |
| pgio->pg_test = (ld && ld->pg_test) ? pnfs_read_pg_test : NULL; |
| } |
| |
| static int pnfs_write_pg_test(struct nfs_pageio_descriptor *pgio, |
| struct nfs_page *prev, |
| struct nfs_page *req) |
| { |
| if (pgio->pg_count == prev->wb_bytes) { |
| /* This is first coelesce call for a series of nfs_pages */ |
| pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, |
| prev->wb_context, |
| req_offset(req), |
| pgio->pg_count, |
| IOMODE_RW, |
| GFP_NOFS); |
| } else if (pgio->pg_lseg && |
| req_offset(req) > end_offset(pgio->pg_lseg->pls_range.offset, |
| pgio->pg_lseg->pls_range.length)) |
| return 0; |
| return NFS_SERVER(pgio->pg_inode)->pnfs_curr_ld->pg_test(pgio, prev, req); |
| } |
| |
| void |
| pnfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, struct inode *inode) |
| { |
| struct pnfs_layoutdriver_type *ld; |
| |
| ld = NFS_SERVER(inode)->pnfs_curr_ld; |
| pgio->pg_test = (ld && ld->pg_test) ? pnfs_write_pg_test : NULL; |
| } |
| |
| enum pnfs_try_status |
| pnfs_try_to_write_data(struct nfs_write_data *wdata, |
| const struct rpc_call_ops *call_ops, int how) |
| { |
| struct inode *inode = wdata->inode; |
| enum pnfs_try_status trypnfs; |
| struct nfs_server *nfss = NFS_SERVER(inode); |
| |
| wdata->mds_ops = call_ops; |
| |
| dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__, |
| inode->i_ino, wdata->args.count, wdata->args.offset, how); |
| |
| trypnfs = nfss->pnfs_curr_ld->write_pagelist(wdata, how); |
| if (trypnfs == PNFS_NOT_ATTEMPTED) { |
| put_lseg(wdata->lseg); |
| wdata->lseg = NULL; |
| } else |
| nfs_inc_stats(inode, NFSIOS_PNFS_WRITE); |
| |
| dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs); |
| return trypnfs; |
| } |
| |
| /* |
| * Call the appropriate parallel I/O subsystem read function. |
| */ |
| enum pnfs_try_status |
| pnfs_try_to_read_data(struct nfs_read_data *rdata, |
| const struct rpc_call_ops *call_ops) |
| { |
| struct inode *inode = rdata->inode; |
| struct nfs_server *nfss = NFS_SERVER(inode); |
| enum pnfs_try_status trypnfs; |
| |
| rdata->mds_ops = call_ops; |
| |
| dprintk("%s: Reading ino:%lu %u@%llu\n", |
| __func__, inode->i_ino, rdata->args.count, rdata->args.offset); |
| |
| trypnfs = nfss->pnfs_curr_ld->read_pagelist(rdata); |
| if (trypnfs == PNFS_NOT_ATTEMPTED) { |
| put_lseg(rdata->lseg); |
| rdata->lseg = NULL; |
| } else { |
| nfs_inc_stats(inode, NFSIOS_PNFS_READ); |
| } |
| dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs); |
| return trypnfs; |
| } |
| |
| /* |
| * Currently there is only one (whole file) write lseg. |
| */ |
| static struct pnfs_layout_segment *pnfs_list_write_lseg(struct inode *inode) |
| { |
| struct pnfs_layout_segment *lseg, *rv = NULL; |
| |
| list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list) |
| if (lseg->pls_range.iomode == IOMODE_RW) |
| rv = lseg; |
| return rv; |
| } |
| |
| void |
| pnfs_set_layoutcommit(struct nfs_write_data *wdata) |
| { |
| struct nfs_inode *nfsi = NFS_I(wdata->inode); |
| loff_t end_pos = wdata->args.offset + wdata->res.count; |
| bool mark_as_dirty = false; |
| |
| spin_lock(&nfsi->vfs_inode.i_lock); |
| if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) { |
| /* references matched in nfs4_layoutcommit_release */ |
| get_lseg(wdata->lseg); |
| wdata->lseg->pls_lc_cred = |
| get_rpccred(wdata->args.context->state->owner->so_cred); |
| mark_as_dirty = true; |
| dprintk("%s: Set layoutcommit for inode %lu ", |
| __func__, wdata->inode->i_ino); |
| } |
| if (end_pos > wdata->lseg->pls_end_pos) |
| wdata->lseg->pls_end_pos = end_pos; |
| spin_unlock(&nfsi->vfs_inode.i_lock); |
| |
| /* if pnfs_layoutcommit_inode() runs between inode locks, the next one |
| * will be a noop because NFS_INO_LAYOUTCOMMIT will not be set */ |
| if (mark_as_dirty) |
| mark_inode_dirty_sync(wdata->inode); |
| } |
| EXPORT_SYMBOL_GPL(pnfs_set_layoutcommit); |
| |
| /* |
| * For the LAYOUT4_NFSV4_1_FILES layout type, NFS_DATA_SYNC WRITEs and |
| * NFS_UNSTABLE WRITEs with a COMMIT to data servers must store enough |
| * data to disk to allow the server to recover the data if it crashes. |
| * LAYOUTCOMMIT is only needed when the NFL4_UFLG_COMMIT_THRU_MDS flag |
| * is off, and a COMMIT is sent to a data server, or |
| * if WRITEs to a data server return NFS_DATA_SYNC. |
| */ |
| int |
| pnfs_layoutcommit_inode(struct inode *inode, bool sync) |
| { |
| struct nfs4_layoutcommit_data *data; |
| struct nfs_inode *nfsi = NFS_I(inode); |
| struct pnfs_layout_segment *lseg; |
| struct rpc_cred *cred; |
| loff_t end_pos; |
| int status = 0; |
| |
| dprintk("--> %s inode %lu\n", __func__, inode->i_ino); |
| |
| if (!test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) |
| return 0; |
| |
| /* Note kzalloc ensures data->res.seq_res.sr_slot == NULL */ |
| data = kzalloc(sizeof(*data), GFP_NOFS); |
| if (!data) { |
| mark_inode_dirty_sync(inode); |
| status = -ENOMEM; |
| goto out; |
| } |
| |
| spin_lock(&inode->i_lock); |
| if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) { |
| spin_unlock(&inode->i_lock); |
| kfree(data); |
| goto out; |
| } |
| /* |
| * Currently only one (whole file) write lseg which is referenced |
| * in pnfs_set_layoutcommit and will be found. |
| */ |
| lseg = pnfs_list_write_lseg(inode); |
| |
| end_pos = lseg->pls_end_pos; |
| cred = lseg->pls_lc_cred; |
| lseg->pls_end_pos = 0; |
| lseg->pls_lc_cred = NULL; |
| |
| memcpy(&data->args.stateid.data, nfsi->layout->plh_stateid.data, |
| sizeof(nfsi->layout->plh_stateid.data)); |
| spin_unlock(&inode->i_lock); |
| |
| data->args.inode = inode; |
| data->lseg = lseg; |
| data->cred = cred; |
| nfs_fattr_init(&data->fattr); |
| data->args.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask; |
| data->res.fattr = &data->fattr; |
| data->args.lastbytewritten = end_pos - 1; |
| data->res.server = NFS_SERVER(inode); |
| |
| status = nfs4_proc_layoutcommit(data, sync); |
| out: |
| dprintk("<-- %s status %d\n", __func__, status); |
| return status; |
| } |